Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 240 [Rate centres in NPA 240] [Dial plan for NPA 240]

NXX: 578

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
240-578 A Frederick MD FRDRMDFRXSX  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240      
240-578 0 Frederick MD FRDRMDFRXSX  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240   2011-09-05   
240-578 1 Frederick MD FRDRMDFRXSX  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240   2011-10-02   
240-578 2 Frederick MD FRDRMDFRXSX  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240   2012-06-03   
240-578 3 Frederick MD FRDRMDFRXSX  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240   2013-05-01   
240-578 4 Frederick MD FRDRMDFRXTX  318J COMCAST IP PHONE, LLC 240   2014-01-14   
240-578 5 Frederick MD FRDRMDFRXSX  6395 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 240   2014-04-01   
240-578 6 Frederick MD FRDRMDFR9MD  5562 METROPCS, INC. 240   2011-10-11   
240-578 7 Frederick MD FRDRMDFR9MD  5562 METROPCS, INC. 240   2011-10-11   
240-578 8 Frederick MD FRDRMDFR9MD  5562 METROPCS, INC. 240   2011-10-11   
240-578 9 Frederick MD FRDRMDFR9MD  5562 METROPCS, INC. 240   2011-10-11   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.